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Theory of Machine

Theory of Machine
Relationship between the number of links (L) and number of pairs (P) is

P = 2L + 2
P = 2L + 4
P = 2L - 2
P = 2L - 4

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Theory of Machine
In S.H.M., the velocity vector w.r.t. displacement vector

Leads by 180°
Are in phase
Leads by 90°
Lags by 90°

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Theory of Machine
The rotating shafts tend to vibrate violently at whirling speeds because

The system is unbalanced
Resonance is caused due to the heavy mass of the rotor
The shafts are rotating at very high speeds
Bearing centre line coincides with the axis

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Theory of Machine
The tractive force is maximum or minimum when the angle of inclination of crank with the line of stroke (θ) is equal to

90° and 180°
0° and 90°
270° and 360°
135° and 315°

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Theory of Machine
The frictional torque transmitted in a flat pivot bearing with assumption of uniform pressure is _________ as compared to uniform wear.

More
Same
None of the listed here
Less

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Theory of Machine
In Meyer's expansion valve, the main valve is driven by an eccentric having an angle of advance from

25°-30°
15°-25°
10°-15°
30°-40°

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